1// Copyright 2014 The Chromium Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5var fileSystemNatives = requireNative('file_system_natives'); 6var GetIsolatedFileSystem = fileSystemNatives.GetIsolatedFileSystem; 7var sendRequest = require('sendRequest'); 8var lastError = require('lastError'); 9var GetModuleSystem = requireNative('v8_context').GetModuleSystem; 10// TODO(sammc): Don't require extension. See http://crbug.com/235689. 11var GetExtensionViews = requireNative('runtime').GetExtensionViews; 12 13// For a given |apiName|, generates object with two elements that are used 14// in file system relayed APIs: 15// * 'bindFileEntryCallback' function that provides mapping between JS objects 16// into actual FileEntry|DirectoryEntry objects. 17// * 'entryIdManager' object that implements methods for keeping the tracks of 18// previously saved file entries. 19function getFileBindingsForApi(apiName) { 20 // Fallback to using the current window if no background page is running. 21 var backgroundPage = GetExtensionViews(-1, 'BACKGROUND')[0] || window; 22 var backgroundPageModuleSystem = GetModuleSystem(backgroundPage); 23 24 // All windows use the bindFileEntryCallback from the background page so their 25 // FileEntry objects have the background page's context as their own. This 26 // allows them to be used from other windows (including the background page) 27 // after the original window is closed. 28 if (window == backgroundPage) { 29 var bindFileEntryCallback = function(functionName, apiFunctions) { 30 apiFunctions.setCustomCallback(functionName, 31 function(name, request, response) { 32 if (request.callback && response) { 33 var callback = request.callback; 34 request.callback = null; 35 36 var entries = []; 37 var hasError = false; 38 39 var getEntryError = function(fileError) { 40 if (!hasError) { 41 hasError = true; 42 lastError.run( 43 apiName + '.' + functionName, 44 'Error getting fileEntry, code: ' + fileError.code, 45 request.stack, 46 callback); 47 } 48 } 49 50 // Loop through the response entries and asynchronously get the 51 // FileEntry for each. We use hasError to ensure that only the first 52 // error is reported. Note that an error can occur either during the 53 // loop or in the asynchronous error callback to getFile. 54 $Array.forEach(response.entries, function(entry) { 55 if (hasError) 56 return; 57 var fileSystemId = entry.fileSystemId; 58 var baseName = entry.baseName; 59 var id = entry.id; 60 var fs = GetIsolatedFileSystem(fileSystemId); 61 62 try { 63 var getEntryCallback = function(fileEntry) { 64 if (hasError) 65 return; 66 entryIdManager.registerEntry(id, fileEntry); 67 entries.push(fileEntry); 68 // Once all entries are ready, pass them to the callback. In the 69 // event of an error, this condition will never be satisfied so 70 // the callback will not be called with any entries. 71 if (entries.length == response.entries.length) { 72 if (response.multiple) { 73 sendRequest.safeCallbackApply( 74 apiName + '.' + functionName, request, callback, 75 [entries]); 76 } else { 77 sendRequest.safeCallbackApply( 78 apiName + '.' + functionName, request, callback, 79 [entries[0]]); 80 } 81 } 82 } 83 // TODO(koz): fs.root.getFile() makes a trip to the browser 84 // process, but it might be possible avoid that by calling 85 // WebDOMFileSystem::createV8Entry(). 86 if (entry.isDirectory) { 87 fs.root.getDirectory(baseName, {}, getEntryCallback, 88 getEntryError); 89 } else { 90 fs.root.getFile(baseName, {}, getEntryCallback, getEntryError); 91 } 92 } catch (e) { 93 if (!hasError) { 94 hasError = true; 95 lastError.run(apiName + '.' + functionName, 96 'Error getting fileEntry: ' + e.stack, 97 request.stack, 98 callback); 99 } 100 } 101 }); 102 } 103 }); 104 }; 105 var entryIdManager = require('entryIdManager'); 106 } else { 107 // Force the fileSystem API to be loaded in the background page. Using 108 // backgroundPageModuleSystem.require('fileSystem') is insufficient as 109 // requireNative is only allowed while lazily loading an API. 110 backgroundPage.chrome.fileSystem; 111 var bindFileEntryCallback = backgroundPageModuleSystem.require( 112 apiName).bindFileEntryCallback; 113 var entryIdManager = backgroundPageModuleSystem.require('entryIdManager'); 114 } 115 return {bindFileEntryCallback: bindFileEntryCallback, 116 entryIdManager: entryIdManager}; 117} 118 119exports.getFileBindingsForApi = getFileBindingsForApi; 120